need help with these questions

[Q3] Solve the problem Silicon Valley Company's estimated formulas are as follows: Sales and Costs Formulas Sales line Y= 5X Costs line Y=X + $ 2,000 Required: 1. Define the profit function. (199+%982.) 2. Contribution Margin ratio ? 3. What is the break-even point in units ? (9413 4** 7.8412) 4. If the company sets the target profit of $4,000, how much is target sales ? ( $4,000 ?)